Magneto for use on internal-combustion engines.



1. AI COLE.

MAGNETO FOR USE ON INTERNAL COMBUSTION ENGINES.

APPLICATION man JULY 28, I9I4.

Patented June 29,1915.

\ ATTNE s JOHN ALBERT COLE, F LEAMINGTON, ENGLAND.

MAGNETO FOR USE ON INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented June 29, 1915.

Application filed July 28, 1914. Serial No. 858,720

To all 407mm it may concern:

Be it known that I, JonN ALBERT COLE, a. subject of the King of Great Britain, residing at Leamington, in the county of VVarwick, England, have invented certain new and useful Improvements in Magnetos for Use on Internal-Combustion Engines, ct which the following is :1 specification.

This invention relates to magnetoslt or use on internal combustion engines, particularly such as are employed on motor Vehicles, and has for its object to provide simplification by dispensing with the ordinary switch and switch wire.

Usually'the contact breaker of the mag neto is 'providcd with a terminal by which a wire is led to a. switch adapted to short circuit the armature current to earth. The contact breaker moves angularly to advance and retard, and as this terminal is generally out of the center it also moves angularly. I therefore provide an carthed contact, in such a position that the terminal engages the contact when the contact breaker is fully retarded. Thus livi'nlly retarding the ontact breaker the current is short circuitcd to earth and the engine stopped.

The carthcd contact may be mounted updn the magneto itself or may be carried by some part oi the engine or chassis. -1

When the terminalv is concentric it is obvious that any suitable contacting piece may be attached to it so that when the/con -tact breaker is retarded it ou ages the ca rthcd contact.

In the accompanying drawings, Figure 1 is an end elevation of a magneto showing one method oi" carrying out this invention. Fig. 2 is a similar view of a modification. Fig. 3 is a side elevation of a detail,

Like letters indicate like parts throughout the drawings.

In both cases the contact breaker is lettered A, and the arm attached thereto to enable the contact breaker to be moved angularly for advancing and retarding the ig nition is letlcrcd I).

In the case shown in Fig. 1. the terminal (I usually prm'idcd tor the attachment of the switch wire is carried radially by the .into the earthed magnets.

contact breaker. In Fig.9 it is centrally arranged.

Attached to any convenient part of the magneto is a spring blade D, shown as being held in place by a screw E which screws In the first case the terminal C is adapted to make contact with the blade I) when the contact breaker is fully retarded, thereby earthing the armature. In the second case an arm F is attached to the terminal C and this makes contact with the car-thing blade D. Obviously the blade or its equivalent may be carried by any suitable part of the engine or the frame of a motor vehicle. By this means the switch and switch wire can be dispensed with.

It is obvious that the switch device might be made a permanent part of the magneto instead ofbeing in the nature of an addition as is the case in the constructions illustrated. Also. where other means than an adjustable contact breaker is provided for altering the timing of the ignition, the invention requires modification in its application, but

I the principle remains the same. c. a switch device, part or? which iscarried by the magncto. adapted to be closed when the timing device is in a certain position, generally fully retarded.

I claim:

1. In a. magneto, the combination of a contact breaker, means for advancing and retarding said contact breaker, a switch member carried by said contact breaker and an earthcd switch member engaged thereby, substantially as set forth.

2. In a magneto, the combination of a contact breaker, means for advancing and retarding said contact breaker, a terminal on said contact breaker and an earthed blade adapted to be engaged by said ter 

